Dress appropriately. One manager will ask you questions about your experience in different situations and how you handled it.
If your interview goes well. You will get a second interview.
Quick 15 minute interview. Asked about why I wanted to work there and what knowledge I had that would help the business. Very laid back process and not overly challenging.
i applied online, got a phone interview, and then got hired. They asked me if I had any experience working out and if I had an supplement knowledge. Then I got the job and started work there the next day.